I've currently placed a bounty on Math.SE (First bounty I've ever placed if I'm correct) and wanted to place another on SO but couldn't, I've tried looking at few questions all older than 48 hours (some frequent/unanswered/hot including my older questions) and none had the "start a bounty" button. I've checked both IPS and Astronomy also and couldn't place bounty. I've also tried to place another on Math.SE (but couldn't).

From the tour/help page it says that an User can have at most 3 active bounties so I'm baffled since I only have 1 active bounty.

Also note that the bounty link color is hard coded to black, so if you're using dark theme in your browser, you won't see the link.
– Shadow WizardMay 29 '18 at 11:51

@ShadowWizard I've just noticed it, what put me off was that the start a bounty link on mobile is inline with "share edit delete..." and not black color. Anyway thanks and if you want you can post an answer.
– kingW3May 29 '18 at 12:59

Oh, you never mentioned you're on mobile. Feel free to post self answer, after all you "solved" it yourself.
– Shadow WizardMay 29 '18 at 13:10